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To overcome the disadvantages of the tradition semi-physical simulation and injection simulation equipment in the performance evaluation of the infrared imaging system(IRIS),a low-cost and reconfigurable IRIS simulator,which can simulate the realistic physical process of infrared imaging,is proposed to test and evaluate the performance of the IRIS.According to the theoretical simulation framework and the theoretical models of the IRIS,the architecture of the IRIS simulator is constructed.The 3D scenes are generated and the infrared atmospheric transmission effects are simulated using OGRE technology in real-time on the computer.